Here is a link to the CAP communications website, with a fix for RS-35A's that were shutting down under heavy load.

In this case the load does not seem to be the problem, but some kind of RF feedback into the reg circuit. ( The Ameriton has it's own supply).Running a turn or two of the power leads through a "clip-on" ferrite cylinder and a maybe even a .05 ceramic across the terminals should help as already suggested.

That being said, I suspect that that you don't have proper shack grounding either. Each device should have it's own ground ( not in tandem or Daisey-chained!!!) to the master bussbar, then the bussbar is strapped to a nearby earth ground. All of the above should be as short as possible.

You may have a very high SWR on the antenna side ( even if you tuner can tune it) causing the RF kickback. What kind of antenna are you using?

I second the motion to read the info available on the repeater-builder.com website.

Astron has made running changes on the design of the RS-35 series, in addition to their other supplies, and sometimes it's hit and miss. Not to open Pandora's Box here... as there is a continual debate, including on the repeater-builder.com website, as to the technical pros and cons of bonding the negative post of the 13.8VDC output to the supply's chassis ground. Most technically-astute hams, including the aforementioned website, state unequivocally that the negative post should not be tied to the power supply's chassis ground. Nevertheless, rumors have it that Astron tied the negative post to chassis ground to eliminate RFI effects upon the voltage regulator IC.

Open up your supply and look to see if there's a jumper from the negative post to chassis ground. If indeed Astron added this jumper to theoretically reduce or eliminate regulator RFI problems, they didn't implement it very well. The "grounding jumper wire" from the negative post is tied to a point on the bottom of the supply's chassis through a star washer, but the chassis is painted and most of these jumpers do not effectively ground the negative output post.

The best solution is to investigate any source of RFI problems induced by your antenna or inadequate station grounding (not from a DC perspective, rather from a RF perspective). Remember, a DC ground and a RF ground are entirely different animals...

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